Blender not loading properly
This is commonly because you installed Blender as one user (administrator) and are running it as a different user.

From http://blenderartists.org/forum/showthread.php?196976-My-Blender-2-5-Interface-is-Mostly-Empty


  Happens when you run Blender as a different user as who installed it (Windows).
  Reason: The blender folder in User-Folder / Appdata /Roaming is required but only there for the user who installed it
  Workaround: Always run Blender as the primary user (Run as Administrator) or: Copy the Blender Foundation folder from Appdata/Roaming of the primary user to your account's folder.


So, Blender doesn't have access to some of the folders it needs because they are on another user's account. This could also apply to some Python scripts. If Python was installed by another user, you might not have access to it on your account.

Hope that helps!